12 unexploded bombs found in car

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LONDON, England (CNN) -- More than a dozen unexploded bombs were found in a car at Luton train station in north London five days after the deadly July 7 terror attack on London's transit system, two sources familiar with the investigation told CNN.

The vehicle was discovered in a parking lot at Luton station on July 12 and the bombs were detonated in a controlled explosion.

Police had closed the train station and the parking lot and cordoned off a 100-yard area around it before investigating the vehicle.

Initially, police said only that the car was believed to be linked to the July 7 bombings which killed 52 commuters plus the four suicide bombers.

A closed-circuit television camera captured the four suspected suicide bombers carrying rucksacks at Luton station at approximately 7:20 a.m. on July 7.

At 8:50 a.m., bombs detonated within 50 seconds of each other on three London Underground trains, and a bus bombing followed about an hour later.

Meanwwhile, police on Wednesday arrested one of the four men they believe to be responsible for last week's attempted bombings of London's mass transit system, an official with knowledge of the investigation told CNN. (Full story)

The official identified Yasin Hassan Omar, a 24-year-old Somali with British residency, as one of four men arrested early Wednesday in Birmingham, about 100 miles north of London.